Given:
Total number of parcels = 4
Total number of post-offices = 5
One parcel can be posted in 5 ways that is in either of the one post offices. So, 5C1. Similarly, for other parcels also it can be posted in 5C1 ways.
Hence the number of ways the parcels be sent by registered post is
5C1 × 5C1 × 5C1 × 5C1 = 5 × 5 × 5 × 5 = 625 ways.
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